Hi Guys, recently I came across an e-commerce site that had cloaked their google adsense ad url. Do you know how they did it?

For example the url was something like this -

Code:

http://rd.example.com/rd2?t=http%3A%2F%2Fwww.google.com%2Faclk%3Fsa%3DL%26ai%3DCw0C2Ejb5Tr-AOqOY2gWc9tjBB-qbi_YB6uzb-SDAp_4LEAEgsk4oB1DJ4t-TBWDJBsgBAaoEGk_Q3NSZd3muAqMXZGr4ckHMYpjedaZCkQhu%26num%3D1%26sig%3DAOD64_12Gl3UJS-Js1TN_d79KWzkXhfW9A%26adurl%3Dhttp%3A%2F%2Fclk.atdmt.com%2FMRT%2Fgo%2F356405041%2Fdirect%2F01%2F%253Fhref%253Dhttp%3A%2F%2Fview.atdmt.com%2Faction%2Fmrt103_PFXMSFTUSMultiProductUnitedStatesGeneri_1%2Fv3%2FsZ0P7cJLO_8769376218_e_syfpxdha01%2F%253Fhref%253Dhttp%25253A%25252F%25252Fwww.microsoft.com%25252Fen-us%25252Ffamily%25252Fdefault.aspx%25253FWT.mc_id%25253DHoliday_CLE_SEA&mid=32049&catId=462&keyword=Laptop+Computers&pos=1&bId=122&tokenId=10J&cobrand=1&countryCode=US&sessionid=820312188272066223&br=13249551435094878619402030102028438&userzip=0&data=_time%3A%3Astart_time%3D1324955143%3Btimestamp%3D1324955154%7Ctracker%3A%3Ahtcnt%3D2%3Brf%3Dwgi

No, but watching with interest

Basically,to bypass any of the tracking that you or the merchant does and any GeoIP redirects that the reviewer may come across, cloak them to the url of the actual merchant lander.

This my friend looks like code generated by ioncube which is very often used by eCommerce websites and CMS to encode .php in the whole website and without ioncube decoder you will not get any info from this. Look at ioncube website
It is probably the most safe way of protecting you assets - don't look good though.